Display system and self-checking method of the display system

Abstract

Provided is a light-emitting diode (LED) driving system. The LED driving system includes an LED current controller, a detector, and a system controller. The LED current controller is configured to control a current flowing through a plurality of LED arrays including at least one LED, such that no current flows through a first LED array from among the plurality of the LED arrays and a current flows through a second LED array from among the plurality of the LED arrays. The detector is configured to detect a sensing voltage from the first LED array. The system controller is configured to determine, based on a comparison result between the sensing voltage and a reference voltage, a failure of the at least one LED included in the second LED array.

What is claimed is: 
     
       1. A light-emitting diode (LED) driving system comprising:
 an LED current controller configured to control a current flowing through a plurality of LED arrays, each of the plurality of LED arrays including at least one LED, such that no current flows through a first LED array from among the plurality of the LED arrays and a current flows through a second LED array from among the plurality of the LED arrays; 
 a detector configured to detect a sensing voltage from the first LED array; and 
 a system controller configured to determine, based on a comparison result between the detected sensing voltage and a reference voltage, a failure of the at least one LED included in the second LED array, 
 wherein the sensing voltage comprises a photovoltaic voltage caused by a light wave received from the at least one LED included in the second LED array. 
 
     
     
       2. The LED driving system of  claim 1 , wherein the LED current controller comprises a switch configured to control a bias applied to the first LED array and the second LED array. 
     
     
       3. The LED driving system of  claim 1 , wherein the system controller is further configured to determine the first LED array and the second LED array from among the plurality of the LED arrays according to a predetermined pattern. 
     
     
       4. The LED driving system of  claim 1 , wherein the system controller is spaced apart from the LED current controller and the detector. 
     
     
       5. The LED driving system of  claim 1 , wherein the detector comprises a comparator configured to output the comparison result based on a difference between the detected sensing voltage and the reference voltage. 
     
     
       6. The LED driving system of  claim 5 , wherein the comparator comprises an amplifier, and
 wherein the amplifier comprises a first input terminal configured to receive the sensing voltage and a second input terminal configured to receive the reference voltage, and 
 wherein the amplifier is configured to output an amplified comparison result by amplifying the difference between the received sensing voltage and the reference voltage. 
 
     
     
       7. The LED driving system of  claim 1 , wherein the reference voltage comprises a previously-detected sensing voltage. 
     
     
       8. The LED driving system of  claim 1 , wherein the system controller is further configured to provide a user interface which includes notification information in response to the failure of the at least one LED included in the second LED array. 
     
     
       9. The LED driving system of  claim 1 , wherein the LED current controller is further configured to control the at least one LED included in the second LED array to emit at least one from among a red light, a green light, a blue light, and any combination thereof. 
     
     
       10. A light-emitting diode (LED) checking method which is implemented in an LED driving system, the LED checking method comprising:
 controlling a current flow such that no current flows through a first LED array comprising at least one LED and such that a current flows through a second LED array comprising at least one LED; 
 detecting a first sensing voltage from the first LED array; 
 after the detecting the first sensing voltage, controlling the current flow such that a current flows through the first LED array and such that no current flows through the second LED array; 
 detecting a second sensing voltage from the second LED array; and 
 adjusting at least one from among an amount of the current flowing through the first LED array and an amount of the current flowing through the second LED array, based on a comparison result between the detected first sensing voltage and the detected second sensing voltage. 
 
     
     
       11. A light-emitting diode (LED) driving system comprising:
 a first LED array comprising at least one LED; 
 a second LED array comprising at least one LED; 
 an LED current controller configured to control an amount of a current flowing through the first LED array and an amount of a current flowing through the second LED array; and 
 a detector configured to detect a first sensing voltage from the first LED array when no current flows through the first LED array, and to detect a second sensing voltage from the second LED array when no current flows through the second LED array, 
 wherein the LED current controller is further configured to adjust at least one from among the amount of the current flowing through the first LED array and the amount of the current flowing through the second LED array, based on a comparison result between the detected first sensing voltage and the detected second sensing voltage. 
 
     
     
       12. A light-emitting diode (LED) checking method which is implemented in an LED driving system, the LED checking method comprising:
 controlling a current flowing through a plurality of LED arrays, each of the plurality of LED arrays including at least one LED, such that no current flows through a first LED array from among the plurality of the LED arrays and a current flows through a second LED array from among the plurality of the LED arrays; 
 detecting a sensing voltage from the first LED array; and 
 determining, based on a comparison result between the detected sensing voltage and a reference voltage, a failure of the at least one LED included in the second LED array, 
 wherein the sensing voltage comprises a photovoltaic voltage caused by a light wave received from the at least one LED included in the second LED array. 
 
     
     
       13. The LED checking method of  claim 12 , wherein the controlling the current flowing through the plurality of the LED arrays comprises applying a zero bias voltage to the first LED array. 
     
     
       14. A non-transitory computer-readable recording medium that stores a program that performs the LED checking method of  claim 12  when executed by a computer. 
     
     
       15. The LED checking method of  claim 12 , wherein the reference voltage comprises a previously-detected sensing voltage. 
     
     
       16. The LED checking method of  claim 12 , further comprising monitoring a brightness change of the at least one LED included in the second LED array, based on the comparison result. 
     
     
       17. The LED checking method of  claim 12 , further comprising providing a user interface which includes notification information in response to the failure in the at least one LED included in the second LED array. 
     
     
       18. The LED checking method of  claim 12 , wherein the controlling the current flowing through the plurality of the LED arrays further comprises controlling the at least one LED included in the second LED array to emit at least one from among a red light, a green light, a blue light, and any combination thereof.